Ironic that a microblogging service leads to lack of nuance. who would of thought?
My first read of trump's tweet was explaining the national guard has to move in because 'looting leads to shooting'. As in, we have to restore order to avoid more people getting shot. At the time Trump tweeted this, there was already one death from a pawn store owner shooting a looter.
So depending on your priors, your PoV, Trump was either promoting violence or trying to quell violence.
culture of 140 characters = more confusion, more division, more tribalism. If we valued well written, long form writing from our leaders we wouldn't be in this mess. Instead, we value twitter and leaders who make great slogans and can push people's buttons in 140 characters.
[Edit: Reading further down the discussion gives some context. That's... disturbing. Still, you are also assuming bad faith on the part of others, and that's not how things are supposed to be done on HN.]